Colourless, tasteless, odourless gas/ less dense than air; diatomic molecules; pop test
helium
2
He
Colourless, tasteless and inert gas/ less dense than air; diatomic molecules
lithium
3
Li
Soft, silvery metal, reactive/ low density/ stored under oil; less reactive than sodium
beryllium
4
Be
Hard, silvery-white metal
boron
5
B
Dark brown powder, non-metal, reactive
carbon
6
C
diamond: very hard, colourless, reflects/refracts light graphite: dull, grey solid/conducts very high melting and boiling points; giant covalent structure
nitrogen
7
N
Colourless, odourless, tasteless gas/ slightly less dense than air; 78% of air; unreactive because of triple covalent bond; diatomic molecules
oxygen
8
O
Colourless, odourless, tasteless gas/ slightly denser than air; 21% of air; diatomic molecules; relights glowing splint
fluorine
9
F
Pale yellow gas/ irritating smell/ poisonous; diatomic molecules; most reactive halogen
diatomic molecules; pop test
diatomic molecules
graphite: dull, grey solid/conducts
very high melting and boiling points; giant covalent structure
- red, relatively unreactive powder
diatomic molecules